package basic.com.liz.learn.design.iterator;

public interface Iterator
{
    /**
     * <之前>
     */
    public Object previous();
    
    /**
     * <之后>
     */
    public Object next();
    
    /**
     * <是否有next>
     */
    public boolean hasNext();
    
    /**
     * <获取第一个>
     */
    public Object first();
    
}
